Your payment flow is broken. I’ll fix it.
I’m a backend engineer who repairs broken payment integrations — Stripe, PayPal, Adyen, FPX and more. Silent webhook failures, double charges, stuck refunds: I find the root cause, not a patch. Fixed fee. You keep 100% of the code.
The failures that cost you money every day
Provider fires the webhook, your endpoint fails signature verification or crashes — orders stay “unpaid” and support tickets pile up.
Retries re-submit the same payment, or a double-click fires two requests. Refunds become a daily ritual.
Test/live keys, webhook URLs and event types mismatched. You only discover it after real money flows.
Refund succeeds at the provider, but your status sync is broken — customers email you, money already left the account.
Failed payment retries (dunning) misconfigured, SCA/3DS flows broken, or invoices are created twice.
Payment providers only log their side. The gap between their logs and yours is where revenue quietly dies.
What I fix
Every engagement starts with a root-cause diagnosis. I don’t guess — I read the logs, replay the events, and trace the code path that actually runs.
Webhook pipeline repair
Signature verification, retries, event replay, dead-letter queues, event-type coverage. Make the provider’s events actually drive your business logic.
Double-charge & idempotency
Idempotency keys, atomic payment state machines, race-condition fixes so one order can never be charged twice.
Checkout & subscription flows
One-time payments, recurring billing, invoices, SCA/3DS handling, dunning and failed-payment recovery.
Gateway migration
Move from PayPal to Stripe, legacy to modern providers, or consolidating multiple gateways — without double-charging or losing customers.
Refunds & chargebacks
Refund/status sync, dispute automation, evidence submission so chargebacks stop being silent losses.
PCI & security basics
PCI-DSS scoping, tokenization done right, sensitive-data hygiene in logs. The boring stuff that keeps you out of trouble.
Fixed fees. No surprises.
You get a quote before any fix work starts. Diagnosis credit applies to the Fix, so you never pay twice for the same problem.
- 48-hour root-cause report
- Affected code paths traced
- Fix plan with exact estimate
- NDA before access, read-only first
- 100% credited toward the Fix
- Code fixes implemented & tested
- Webhook repair: typically $499–$899
- Full checkout rebuild: fixed quote
- Deploy support & verification
- 30-day follow-up included
- Monthly payment-flow health check
- Webhook & error-log review
- 2 hours of fixes included
- Priority response (24h)
- Pause or cancel anytime
Payment: card via secure payment link (Visa/Mastercard, FPX, DuitNow) or bank transfer — instructions are on your invoice. Prices in USD; invoiced in USD or MYR.
From broken to billing, in four steps
Tell me what’s broken
Share symptoms, error logs, and your stack via the form or a short call. No prep required.
48-hour diagnosis
A root-cause report in plain language plus code-level detail, and an exact fixed-fee quote for the fix.
I fix it & prove it
Changes implemented with tests, so you review a clean diff. You own everything. NDA available.
Done — or cared for
Handover notes for your team, 30 days of follow-up free. Upgrade to Flow Care if you want it monitored.
An engineer, not an agency
You talk to the person coding
No account managers, no ticket roulette. One engineer owns your problem end to end.
SEA + global gateway experience
Stripe and PayPal, but also FPX, GrabPay, Touch ’n Go, Xendit, Midtrans, Razorpay — the gateways most Western contractors have never touched.
You own the code
No lock-in, no proprietary platform. Fixes land in your repository, in your stack: Laravel, Node, Python, Go, Rails, .NET.
No fix, no fee
If the diagnosis is wrong or I can’t fix it, you don’t pay for the fix. The report is yours either way.
UTC+8, overlapping with the world
Based in Malaysia (MYT). Morning overlap with Europe, evening overlap with the US — fast turnaround for both.
Safe by default
NDA signed before access, read-only scope first, sandboxed test data encouraged. Your secrets stay yours.
Questions, answered
Is it safe to give you access to my code?
Which payment providers do you work with?
Which tech stacks?
How fast can you fix it?
What if you can’t find the root cause?
I’m a solo founder with a tiny budget. Can we start smaller?
Tell me what’s broken
Prefer email or a call? Either works. Attach logs, your provider dashboard screenshots, or a loom — the more context, the faster the diagnosis.
✉ [email protected] 🕑 Mon–Sat, ~09:00–22:00 UTC+8 (MYT) ⚡ Diagnosis: $99 · credited toward your fixNDA available on request. Read-only access first, sandboxed test data encouraged.